Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

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Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.24

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

Upper Left Quadrant	Lower Left Quadrant	Lower Right Quadrant	Upper Right Quadrant
1. Tendon m. palmaris longus 2. Median nerve 3. Tendon m. flexor carpi radialis 4. Antebrachial fascia, lower forearm 5. Tendon m. flexor pollicis longus 6. Radial a. 7. Superficial fascia, lower forearm 8. Pronator quadratus m.	9. Tendon m. abductor pollicis longus 10. Tendon m. brachioradialis, insertion 11. Tendon m. extensor pollicis brevis 12. Radius 13. Tendon m. extensor carpi radialis longus 14. Tendon m. extensor carpi radialis brevis 15. Extensor pollicis longus m. and tendon 16. Tendons m. extensor digitorum communis	17. Extensor indicis m. and tendon 18. Tendon m. extensor digiti minimi 19. Tendon m. extensor carpi ulnaris 20. Ulna, head 21. Pronator quadratus m. (last appearance)	22. Flexor carpi ulnaris m. and tendon 23. Ulnar nerve 24. Flexor digitorum profundus m. and tendons 25. Ulnar a. 26. Tendons m. flexor digitorum superficialis

In this section pronator quadratus (8, 21) is thinning and is seen for the last time. All other muscles are tendinous.

The radius is still expanding and will ultimately articulate with three carpal bones. The head of the ulna (20) is beginning to articulate with the radius (12). Note the articular cartilage at its medial border (articular surface) adjacent to the radius.

The tendons of flexor digitorum superficialis (26) and profundus (24) and flexor pollicis

longus (5) and the median nerve (2) are already enclosed within a fascial covering before entering the carpal tunnel. Flexor carpi radialis (3) enters the hand through its own osteofibrous tunnel formed by the attachment of the flexor retinaculum to the two borders of the groove on the trapezium. The tendon of flexor carpi radialis (3) is already separated by a fascial sheath (4) from the tendons that enter the carpal tunnel.

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